JPH05340434A - Variable displacement type hydraulic brake - Google Patents

Abstract

PURPOSE:To make the extent of absorption power alterable in keeping an impeller revolution constant intact by installing a diaphragm, capable of expansion or contraction, in space between stator blades themselves and also a diaphragm expansion control means, injecting and regulating a capacity variable fluid, in this diaphragm respectively. CONSTITUTION:When the extent of absorption power in a hydraulic brake is reduced, a pressure chamber 61 is pressurized with a capacity variable fluid by a pressure device 6, and if it has cane to the specified pressure, a valve 63 is closed. At this time, a diaphragm 5 expands, while a filling quantity in a braking fluid such as water or the like in a blade passage lying between an impeller 1 and a stator 2a is decreased, and thereby the absorption power as the hydraulic brake is abated. When this absorption power is made larger, the valve 63 is opened, lowering the extent of pressure in the pressure chamber 61 up to the specified pressure, and then this valve 63 is closed. When the diaphragm 5 withers, and the filling quantity of the braking fluid in the blade passage between the impeller 1 and the stator 2a is increased the other way, and thus the absorption power grows. With this constitution, the absorption power is thus alterable in keeping a revolving speed of the impeller constant intact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid brake used for a windlass for anchoring ships and offshore structures, winches and the like, and more particularly to a variable displacement fluid brake whose absorption power can be changed.

[0002]

2. Description of the Prior Art As shown in FIGS. 5 (longitudinal sectional view) and FIG. 6 (A-A cylindrical surface development view of FIG. 5), a conventional hydraulic brake is a casing composed of a stator casing 2 and a cylindrical casing 3. In addition, the rotary shaft 4 is provided in the same casing in a fluid-tight manner, and the rotary shaft 4 is supported by a bearing 25 mounted on the stator casing 2. An impeller 1 that can rotate in the casing together with the rotary shaft 4 is fixed to the rotary shaft 4, and a stator casing 2 is fixed to the inner wall of the stator casing 2 so as to face the blades 11 of the impeller 1. A stator 2a including a plurality of blades 21 is provided.

Further, the stator casing 2 has blades.
A water supply ring 22 is provided in an annular shape in the circumferential direction behind the water supply port 21, and the water supply hole 22 communicates with the blade passage formed between the stator 2a and the impeller 1.
23 are provided. A water supply port 24 for supplying water as a braking fluid to the vane passages via a water supply ring 22 is provided on the outer end surface of the stator casing 2, while the cylindrical casing 3 serves as an outlet for the braking fluid. Drain 31
Is provided on the side wall.

With such a structure, when a rotating machine such as a windlass (not shown) connected to the outer end of the rotary shaft 4 rotates, water as a braking fluid that accumulates between the impeller 1 and the stator 2a is impeller. Give 1 resistance. This suppresses an increase in the rotation speed of a rotating machine such as a windlass. The power due to the resistance force becomes thermal energy and raises the temperature of water.

The above-mentioned water as a braking fluid is supplied from a water supply port 24 by a pump (not shown) and flows between the impeller 1 and the stator 2a through the water supply ring 22 and the water passage hole 23. Here, after absorbing the heat energy, it is discharged to the outside through the drainage port 31. In this way, the water inside the fluid brake is sequentially replaced, so that the temperature rise of the water is limited.

[0006]

By the way, in the conventional fluid brake as described above, the absorbed power is the impeller 1.
However, there is a problem in that the absorption power cannot be changed without changing the rotation speed of the impeller 1. The present invention is intended to solve such a problem, in which the capacity of the vane passage between the impeller and the stator in the fluid brake is made variable so that the absorbed power is changed while the rotational speed of the impeller remains constant. It is an object of the present invention to provide a variable displacement fluid brake that is made possible.

[0007]

In order to achieve the above-mentioned object, a variable displacement fluid brake of the present invention comprises a casing having an inlet and an outlet for a braking fluid, and a rotary shaft fluid-tightly inserted into the casing. And an impeller mounted on the same rotating shaft and capable of rotating together with the same rotating shaft in the casing,
A fluid brake comprising a stator composed of a plurality of blades fixed to the inner wall of the casing so as to face the blades of the same impeller, wherein expansion and contraction between the stator blades on the inner wall of the casing is possible. It is characterized in that it is provided with a mounted diaphragm, and is provided with a diaphragm expansion control means capable of injecting and adjusting a fluid for variable volume into a space surrounded by the diaphragm.

[0008]

In the variable displacement fluid brake of the present invention described above,
First, in order to reduce the absorption power, a variable volume fluid is injected by the diaphragm expansion control means into the space surrounded by the diaphragm mounted between the stator blades on the inner wall of the casing to expand the diaphragm. , The action of reducing the filling amount of the braking fluid between the impeller and the stator is performed. On the contrary, when the absorption power of the fluid brake is increased, the diaphragm expansion control means contracts the diaphragm to increase the filling amount of the control fluid between the impeller and the stator. Be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A variable displacement type hydraulic brake as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a development view of a cylindrical surface AA of FIG. 1, and FIG. FIG. 4 is an explanatory diagram of the operating state, and FIG. 4 is an explanatory diagram of the operating state different from FIG. As shown in FIGS. 1 and 2, the variable displacement fluid brake of this embodiment is similar to the conventional fluid brake.
A casing composed of a stator casing 2 and a cylindrical casing 3 is provided, and a rotary shaft 4 penetrating in a fluid-tight manner is provided in the casing, and the rotary shaft 4 is supported by a bearing 25 mounted on the stator casing 2. ing. An impeller 1 that can rotate in the casing together with the rotary shaft 4 is fixed to the rotary shaft 4, and a stator casing 2 is fixed to the inner wall of the stator casing 2 so as to face the blades 11 of the impeller 1. Multiple feathers
A stator 2a consisting of 21 is provided.

Further, the stator casing 2 has blades 21
A water supply ring 22 is provided annularly in the circumferential direction behind the water supply hole, and the water supply hole 22 is provided so as to connect the water supply ring 22 and a blade passage formed between the stator 2a and the impeller 1 to each other.
23 are provided. Further, a water supply port for supplying water as a braking fluid to the blade passages through the water supply ring 22.
24 is provided on the outer end surface of the stator casing 2, while the cylindrical casing 3 is provided with a drain port 31 on the side wall thereof, which serves as an outlet for the braking fluid.

In addition to the structure similar to that of the conventional fluid brake, the fluid brake of this embodiment has blades 21 of the stator 2a on the inner wall of the stator casing 2.
Diaphragm 5 mounted so that it can expand and contract between the two
It has Further, in the stator casing 2, a pressurizing chamber 61, which is separate from the water supply ring 22, is provided annularly behind the diaphragm 5, and the pressurizing chamber 61 is provided with a diaphragm space 51 surrounded by the diaphragm 5 by a communication hole 64. It is in communication.
Further, the pressurizing chamber 61 is connected to the pressurizing device 6 via the valve 63 by the pressurizing pipe 62, whereby the volume varying fluid is injected and adjusted into the diaphragm space 51 to control the expansion degree of the diaphragm 5. ..

Since the variable displacement fluid brake of this embodiment is constructed as described above, the following operation is performed. First, as shown in FIG. 3, in order to reduce the absorption power of the fluid brake, the pressurizing device 61 pressurizes the pressurizing chamber 61 with the variable volume fluid by the pressurizing device 6, and when the predetermined pressure is reached, the valve is closed.
Close 63. At this time, the diaphragm 5 swells, the filling amount of the braking fluid such as water in the blade passage between the impeller 1 and the stator 2a decreases, and the absorption power of the fluid brake decreases.

On the other hand, as shown in FIG. 4, when increasing the absorption power of the fluid brake, the valve 63 is opened and the pressurizing chamber is opened.
The pressure of 61 is reduced to a predetermined pressure, and the valve 63 is closed. At this time, the diaphragm 5 collapses, and the impeller 1 and the stator 2
The filling amount of the braking fluid in the vane passage between and a increases, and the absorption power as the fluid brake increases. In this way, in the variable displacement fluid brake of this embodiment, it is possible to change the absorption power while keeping the rotational speed of the impeller constant.

[0014]

As described above in detail, according to the variable displacement fluid brake of the present invention, the expandable and contractible diaphragms are provided between the stator blades on the inner wall of the casing and are surrounded by the diaphragms. Since the amount of braking fluid filled in the passage between the impeller and the stator can be changed with a simple structure that includes a diaphragm expansion control means that can inject and adjust the variable volume fluid into the space, the rotation of the fluid brake can be changed. The effect is that the absorption power can be changed while keeping the number constant.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a variable displacement fluid brake as one embodiment of the present invention.

2 is a development view of the AA cylindrical surface of FIG. 1. FIG.

FIG. 3 is an explanatory view of an operating state of the variable displacement fluid brake of FIG.

FIG. 4 is an explanatory diagram of an operating state different from that of FIG.

FIG. 5 is a vertical cross-sectional view of a conventional fluid brake.

6 is a development view of the AA cylindrical surface of FIG.

[Explanation of symbols]

 1 Impeller 11 (impeller) blade 2 Stator casing 2a Stator 21 (stator) blade 22 Water supply ring 23 Water passage hole 24 Water supply hole 25 Bearing 3 Cylindrical casing 31 Drain hole 4 Rotating shaft 5 Diaphragm 51 Diaphragm space 6 Pressurizer 61 Pressurization Chamber 62 Pressurized piping 63 Valve 64 Communication hole

Claims (1)

[Claims] 1. A casing having an inlet and an outlet for a braking fluid, a rotary shaft penetrating fluid-tight into the casing, and an impeller mounted on the rotary shaft and rotatable with the rotary shaft in the casing. And a stator comprising a plurality of vanes fixed to the inner wall of the casing so as to face the vanes of the impeller, the expansion and contraction between the vanes of the stator on the inner wall of the casing. A variable displacement fluid brake, comprising a diaphragm that is mounted as possible, and a diaphragm expansion control means that can inject and adjust a variable volume fluid into a space surrounded by the diaphragm.